sound from oscillator

[okbro]

is it possible that an oscillator(like LC oscillator or wien-bridge etc) create sound? i mean to connect buzzer or speaker to an oscillator to hear the sound?

 

[Externet]

Yes. The frequency has to be in the audible range and the transducer too.

 

[okbro]

how to connect a speaker to a colpitts oscillator?

 

[Lightium]

I think a colpitts oscillator runs at too high a frequency to connect a speaker and what your looking for is a phaseshift oscillator.

 

[Externet]

The oscillator power capability must be able of driving the speaker or earphone. If not, signal must be amplified to do the connection.

 

[Nigel Goodwin]

I think a colpitts oscillator runs at too high a frequency to connect a speaker and what your looking for is a phaseshift oscillator.

Why? - a colpitts isn't constrained in any way - you just need the correct inductance and capacitance values.

However, it's certainly not a very good idea - and there are various better options for audio oscillators, including wien bridge as he mentioned, or phase shift as you did.

 

[JimB]

Well, what goes around, comes around.
I must be an old fossil living in the past!

This post awakened in the fetid recesses of my memory:

https://www.electro-tech-online.com/threads/your-first-electronics-projects.156131/#post-1346917

A colpitts oscillator that runs at audio frequencies, who would have thought it?

The awkward part of such a circuit is a suitable inductor, which in this case was a telephone type earpiece..

JimB

 

[danadak]

Classic RC phase shift osc.....

RC Phase Shift Oscillator using Op-Amp

A Phase Shift Oscillator is an electronic oscillator circuit which produces sine wave output. It can either be designed by using transistor or by using an Op-amp as inverting amplifier.

circuitdigest.com

About RC oscillators

Or wein bridge with AGC - https://learnabout-electronics.org/Oscillators/osc34.php



Regards, Dana.

 

[okbro]

my oscillator generates signal with 8 to 10mV output sine wave(LC oscillator, f=150KHz). But I need around 1V to 2V amplitude signal. I tried to amplify with simple BJT amplifier. Both the oscillator and the amplifier I am using has 5V power supply. With 9V power I get higher amplitude but still not high enough(1V to 2V).

- with the problem of sound I have another plan, just need the 150KHz signal with 1 to 2V amplitude

 

[Lightium]

If you have 8-10mV of voltage and need 1-2 volts, that's a gain of between 100 and 200.

 

[JimB]

with the problem of sound I have another plan, just need the 150KHz signal with 1 to 2V amplitude

Are you really expecting to hear 150kHz?
ie listen to it with your ears?

The accepted upper frequency of human hearing is about 20kHz.
When I was 16 years old, I could hear 18kHz, 57 years later I can hear 5kHz on a good day.

JimB

 

[danadak]

Sooo many questions :

1) You want 150 Khz for what reason ?
2) Waveform you want, sine, square, saw, tri.....?
3) We know you want 1 - 2 V.
4) What accuracy do you want ?
5) If sine do you care about distortion ? If yes your target.
6) As pointed out, you cannot hear 150 Khz, so is 150 Khz still what you want ?

Regards, Dana.